Oracle Cloud and iptables

Oracle-provided images have some unusual iptables rules by default, and need to be removed for nodes to work as expected.

They are in the iptables chain InstanceServices.

To remove them:

iptables --list INPUT --line-numbers
# ...
# 11   REJECT     all  --  anywhere             anywhere             reject-with icmp-host-prohibited

iptables --list OUTPUT --line-numbers
# ...
# 6    InstanceServices  all  --  anywhere             link-local/16

iptables --delete INPUT 11
iptables --delete OUTPUT 6
iptables --flush InstanceServices
iptables --delete-chain InstanceServices